Note that even though the fact that e.g. a cat has the right to moo and a cow has the right to mew are not explicitly mentioned in this declaration, it is commonly accepted that these rights are implicitly guaranteed by the document as well.
Animals have also gained rights through religion. For example in India a cow could walk into your house and eat your food and watch your TV, and drink your wife`s breast milk, and all because he is holy you cannot kick his bovine ass with a golf club, like if it was that human dude who`s ass you wanted to kick.

There is some doubt as to whether humans are animals, and in the likely event that they are not, it can be clearly stated that they have no rights at all.